Cheap, small CC2500

Nitro_123
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23 Mar 2016 04:30 #45027 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

Is it possible to take off the epoxy ?
I did a bit of research and see that it's possible but may kill the chip itself.
Is it worth asking the seller for the circuit diagram ?

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victzh
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23 Mar 2016 04:40 #45028 by victzh

Replied by victzh on topic Cheap, small CC2500

No need to take off epoxy. There are limited number of ways it can be connected - PA/LNA needs 2 lines to control and CC2500 has only 3 general purpose in/out lines. It's easier to test it.

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Nitro_123
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23 Mar 2016 09:09 - 23 Mar 2016 09:10 #45038 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

I asked the seller for the chip diagram and he did give me some files but they dont seem useful

i'm uploading them to my mediafire anyways. You all can have a look

www.mediafire.com/download/acdrtpslldrec4d/7459.zip

Last edit: 23 Mar 2016 09:10 by Nitro_123.

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victzh
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11 Apr 2016 23:43 #46333 by victzh

Replied by victzh on topic Cheap, small CC2500

Unfortunately, the module I bought ( www.ebay.com/itm/2-4GHz-Wireless-Transce...t-home-/231784616230 ) seems to have opposite connections to what Deviation expects - GDO2 to TXEN and GDO0 to RXEN.

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Nitro_123
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12 Apr 2016 22:30 #46391 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

Would it be easy to change the connections in code ? Like a search + replace +compile and it solves the problem ?
I would like it if these CC2500s could be used by deviation

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victzh
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12 Apr 2016 23:35 #46395 by victzh

Replied by victzh on topic Cheap, small CC2500

It would, but then you get your own Deviation build, specifically for these modules. Better way is to have this info in config files somewhere.

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Nitro_123
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14 May 2016 10:16 - 14 May 2016 10:27 #48404 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

I hope PhracturedBlue or mwm or someone has a look at this.
Is it possible to have a new
; enable-cc2500_small = A14
or something like a
; has_pa-cc2500_inverted = 1

and then it loads a new cc2500 file which works with the modules with different hardware ? Just like victzh said before ?
I ask because this module is a lot cheaper than the other modules.
Sorry for the (sort of ) necropost but I think its worth it

Last edit: 14 May 2016 10:27 by Nitro_123. Reason: Welp HTML code did not work

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Arakon
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14 May 2016 10:28 #48406 by Arakon

Replied by Arakon on topic Cheap, small CC2500

It doesn't look to have a LNA, so it would be of limited use for telemetry (i.e. frsky).. I'd rather spend the 5 bucks extra on a known good module.

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Nitro_123
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14 May 2016 10:30 #48407 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

Arakon the module victzh has posted does have a pair/lna but it is wired the other way so I believe with some changes in code the PA should be able to be used

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john
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30 May 2016 05:37 #49539 by john

Replied by john on topic Cheap, small CC2500

victzh wrote: @mwm, where is this Module List? I tried to find it myself but failed.

I recently have seen this thing on eBay: www.ebay.com/itm/2-4GHz-Wireless-Transce...6:g:zqIAAOSwo3pWb9r6

They claim to have PA/LNA for under $4 ($6.50 with shipping).

anyone test range this module for TX ? good result ?

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Fernandez
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30 May 2016 07:29 #49544 by Fernandez

Replied by Fernandez on topic Cheap, small CC2500

These are nice for Midelic, make a true diversity / redundant link, without antenna switch, using 2 of these receiver in a Rx.

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Nitro_123
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30 May 2016 09:07 #49547 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

I'm trying to use the one with no PA and lna and it is not binding to a new d4r-ii.
The d4r-ii did bind once but then after that it says no signal
Might switch it for the one with PA and lna and see what happens
Fernandez midelic is hesitant to use these. He said something about how the PA ' gdo0 and gdo2 pins are wired or something. I had also asked him before but he said declined.
You can check the diy FrSky TX/Rx module thread on regroups for more information.
Since this is all off the top of my head I may be wrong

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mwm
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31 May 2016 11:11 #49626 by mwm

Replied by mwm on topic Cheap, small CC2500

Try adjusting the tuning in the protocol options.

Do not ask me questions via PM. Ask in the forums, where I'll answer if I can.

My remotely piloted vehicle ("drone") is a yacht.

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Nitro_123
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31 May 2016 11:25 - 31 May 2016 11:53 #49628 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

After a lot of fiddling around I would like to report

SUCCESSSSSSSSS
The small cc2500 does work with my D4r-ii
It works with freq-fine < -20. This is very strange. Oh well as long as it works

Edit: More observations
Only works with negative values of freq_coarse and freq_fine.
Best values for me are
fine (-30)
coarse (- 27)

Last edit: 31 May 2016 11:53 by Nitro_123.

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bianchifan
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01 Jun 2016 07:03 #49704 by bianchifan

Replied by bianchifan on topic Cheap, small CC2500

I have some handful of those modules, but they should do a receiving job

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Nitro_123
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10 Jun 2016 14:27 #50328 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

Would like to confirm that wasp09 has made a build that works with the ebay cc2500 with the pa/lna
Link here:
www.rcgroups.com/forums/showpost.php?p=34977927&postcount=4897
Victzh or someone please can you integrate this into the nightlies ?

Big thanks to wasp09 for making this happen

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dado099
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12 Jun 2016 09:29 #50461 by dado099

Replied by dado099 on topic Cheap, small CC2500

Wonderful,
I also have one of this incoming, can anyone please make a nightly build with this modification ?
Come on, should be very easy !
Thanks anyway.

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dado099
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07 Jul 2016 13:24 #51403 by dado099

Replied by dado099 on topic Cheap, small CC2500

After one month of waiting I just received this module, it is incredibly small.
I just installed and it perfectly binds to skyartec, but obviously it has a ridiculous range because of the inverted PA/LNA lines.
Is there anybody who is willing to make the build suggested by nitro_123, for a devo 6s ? I can pay for it !

thanks

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Nitro_123
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07 Jul 2016 13:29 #51404 by Nitro_123

Replied by Nitro_123 on topic Cheap, small CC2500

I think the changes are in th3 newest nightlies
I think you have to add config_cc2500=0x01 to your hardware.ini
if someone can clarify itd be great

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